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net: sched: mq: add simple offload notification

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mq offload is trivial, we just need to let the device know
that the root qdisc is mq.  Alternative approach would be
to export qdisc_lookup() and make drivers check the root
type themselves, but notification via ndo_setup_tc is more
in line with other qdiscs.

Note that mq doesn't hold any stats on it's own, it just
adds up stats of its children.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski
2018-05-25 21:53:35 -07:00
committed by David S. Miller
parent 2ef3c253f1
commit f971b13230
3 changed files with 30 additions and 0 deletions
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19
net/sched/sch_mq.c
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@@ -16,6 +16,7 @@
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/pkt_sched.h>
#include <net/sch_generic.h>
@@ -23,12 +24,28 @@ struct mq_sched {
struct Qdisc **qdiscs;
};
static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd)
{
struct net_device *dev = qdisc_dev(sch);
struct tc_mq_qopt_offload opt = {
.command = cmd,
.handle = sch->handle,
};
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return -EOPNOTSUPP;
return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt);
}
static void mq_destroy(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct mq_sched *priv = qdisc_priv(sch);
unsigned int ntx;
mq_offload(sch, TC_MQ_DESTROY);
if (!priv->qdiscs)
return;
for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
@@ -70,6 +87,8 @@ static int mq_init(struct Qdisc *sch, struct nlattr *opt,
}
sch->flags |= TCQ_F_MQROOT;
mq_offload(sch, TC_MQ_CREATE);
return 0;
}